docs: add article about 3D-scanning drone (#139)

* Added a photo of 3d-scanning drone

* Added a new article about 3d-scanning drone.

* Updated the article

* Included the new article about 3d-scanning drone.

* Added a new article.

* Included a new article

3D-scanning drone

* Fixed bugs

* Fixed md syntax

docs/en/3dscan.md

@@ -0,0 +1,23 @@
+# 3D-scanning drone
+
+<img src="../assets/3d_drone_1.jpg" title="3D-scanning drone" height=500px>
+
+The project was created in collaboration with Texel inc. that develops 3D-scanners for scanning people.
+
+Our fellows from Texel provided a module consisting of a Raspberry Pi and a PrimeSense 3D-sensor.
+
+We provided a Clever 3 drone that's capable of autonomous flight and wrote a flight program.
+
+To make it all work we conducted many tests, made changes in the drone's design and tuned the drone properly.
+
+## Video
+
+<iframe width="560" height="315" src="https://www.youtube.com/watch?v=aqBION3TVhg" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
+
+## Team
+
+The project was made by:
+
+* Timofei Kondratiev [Copter Express] - drone assembly, writing and debugging the program, conducting tests;
+* Anton Maltsev [Copter Express] - modeling of the protection of the propellers;
+* Andrei Poskonin [Texel] - modifying the Texel's software to work on Raspberry Pi.

docs/en/SUMMARY.md

@@ -55,6 +55,7 @@
   * [Copter spheric guard](shield.md)
   * [Face recognition system](face_recognition.md)
   * [Android RC app](android.md)
+  * [3D-scanning drone](3dscan.md)
   * [Copter Hack 2018](copterhack2018.md)
   * [Copter Hack 2017](copterhack2017.md)
 * Supplementary materials